A dosing device with a rotating piston cylinder

ABSTRACT

A filling device for filling in doses of soft-plastic material with a piston, which comprises a filling housing and a dosaging cylinder rotatably mounted in the housing and alternately into a filling position and an emptying position. A piston reciprocates in the cylinder and is divided by at least one portion of larger diameter and a portion of smaller diameter into a stepped-up piston. The inner surface of the cylinder is stepped down complementary to the stepped-up piston. The stepped-up piston defines in the cylinder an annular chamber at the end face of the portion of the piston having a larger diameter and a cylindrical chamber at the end of the portion of the cylinder having smaller diameter. The filling housing has a filling opening within the range of the chambers, and the cylinder has a lateral opening within the range of the annular chamber and the cylindrical chamber, respectively, thereby providing alternately communication with the housing for filling the chambers and with the opening in the housing, respectively, for emptying the cylinder, depending upon the position of the cylinder.

United States Patent Inventors Heinz Freckmann Dusseldorf; KarlheinzMayer, Wangen, both of, Germany Appl. No. 851,338

Filed Aug. 19, 1969 Patented June 8, I971 Assignee Benz 8: IIilgersG.m.b.II.

Dusseldorf, Germany Priority Aug. 21, 1968 Germany P 17 86 127.7

A DOSING DEVICE WITH A ROTATING PISTON CYLINDER 2,972,435 2/1961 McCarty3,136,268 6/1964 Gageant ABSTRACT: A filling device for filling in dosesof soft-plastic material with a piston, which comprises a fillinghousing and a dosaging cylinder rotatably mounted in the housing andaltemately into a filling position and an emptying position. A pistonreciprocates in the cylinder and is divided by at least one portion oflarger diameter and a portion of smaller diameter into a stepped-uppiston. The inner surface of the cylinder is stepped down complementaryto the stepped-up piston. The stepped-up piston defines in the cylinderan annular chamber at the end face of the portion of the piston having alarger diameter and a cylindrical chamber at the end of the portion ofthe cylinder having smaller diameter. The filling housing has a fillingopening within the range of the chambers, and the cylinder has a lateralopening within the range of the annular chamber and the cylindricalchamber, respectively, thereby providing alternately communication withthe housing for filling the chambers and with the opening in thehousing, respectively, for emptying the cylinder, depending upon theposition of the cylinder.

PATENTEDJUN 81971 35 503 w I 72 FIG 2 .JNVEN TOR 369% Ma; 911K44 K ADOSING DEVICE WITH A ROTATING PISTON CYLINDER The present inventionrelates to a dosing device, in general, and to filling devices for dosedfilling of soft plastic material with a piston, which is mounted axiallydisplaceable in a rotary cylinder equipped with an opening andswitchable alternately for filling and emptying.

Volume dosing of this type has been known for some time. Such devicescomprise substantially a filling housing fed from the outside with thematerial, in which filling housing is rotatably mounted a dosingcylinder, which is equipped with a jacket opening. In this dosingcylinder is axially displaceably provided a dosing piston for suctionand pressing out. By a coordinated rotary and transverse movement,respectively, of the cylinder and of the piston, a volume fillingexactly to its weight is obtained, on the one hand, by suction and, onthe other hand, by pressing out of the material. In order to bring aboutan increase of the filling output, it is known, among other means, toarrange two such cylinder piston systems parallel relative to eachother, the pistons of which are displaced jointly and simultaneously bymeans of a double lever.

It is one object of the present invention to provide a dosing device, tocreate a simpler and more economical dosing device, for the purpose ofan output increase.

It is another object of the present invention to provide a dosingdevice, wherein the piston is divided by a diameter change into astepped-up piston, which is arranged in the similarly stepped-downrotary cylinder such, that at least a circular ring space and at the endof the piston a cylinder chamber is created, within the range of whichajacket opening is provided which serves as inlet opening and outletopening, respectively. By selection of the ratio of the free piston endfaces relative to each other the possibility results, to fill equal ornonequal volumina simultaneously.

With these and other objects in view which will become apparent in thefollowing detailed description, the present inven tion will be clearlyunderstood in connection with the accompanying drawings, in which:

FIG. 1 is a vertical section of the closing cylinder mounted in thefilling housing and the stepped-up piston arranged in the dosingcylinder in the position prior to the suction operation; and

FIG. 2 is a vertical section, similar to that shown in FIG. I, however,the piston and cylinder position, respectively, being shown at the startof the pressing out of the material.

Referring now to the drawing, the filling device comprises a fillinghousing I and a rotary cylinder 2 rotatably mounted in the fillinghousing 1. A stepped-up piston 3, reciprocated by a piston rod 4, isarranged axially displaceable in the rotary cylinder 2. A storagecontainer 7 receiving the material to be dosed is provided on thefilling housing 1. A conventional shifting drive 10 is provided forrotation of the cylinder 2. For filling the material into containers l3and 14, the filling device applies two mouth pieces 11 and 12, extendingfrom the filling housing 1 in communication with openings in the latter,and the containers l3 and 14 are disposed adjacent the mouth pieces 11and 12, respectively,

The working cycle of the filling device can be divided into a suctionphase and a press-out phase. The suction phase starts with a returnstroke of the stepped-up piston 3 from the position disclosed in FIG. 1and terminates with the rearmost position of the piston 2, as shown inFIG. 2. At the start of the suction phase, the chambers 5 and 5a areconnected by means of the openings 6 and 6a of the rotary cylinder 2, incase ofa corresponding position of the rotary cylinder 2 with the dosinghousing I and the storage container 7, respectively. During the returnstroke of the step-up piston 3, the latter being drawn by the piston rod4, the material present in the storage container 7 will be sucked outfrom the latter corresponding to the volume of the piston strokesimultaneously in both chambers 5 and 5a. The amount of the sucked-upvolume in both chambers 5 and 5a can be equal or different in accordancewith the ratio of the circular ring face 8 to the circular face 9 of thestep-up piston 3.

By rotation of the rotary cylinder 2 by means of the drive I0 into theposition shown in FIG. 2, the press-out phase is started, whichterminates with the position of the step-up piston 3, as shown inFIG. 1. During the press-out stroke of the step-up piston 3, thematerial present in the chambers 5 and 5a is pressed out simultaneouslyinto the containers l3 and 14 to be filled, by means of the connectionof the rotary cylinder 2 with the mouth pieces 11 and 12 through theopenings 6 and 6a of the filling housing 1. Upon following returnrotation of the rotary cylinder 2, a new operation cycle starts withsuction phase and a press-out phase.

While we have disclosed one embodiment of the present invention, it isto be understood that this embodiment is give by example only and not ina limiting sense.

We claim:

1. A filling device for filling in doses of soft-plastic material with apiston, comprising a filling housing,

a dosaging cylinder rotatably mounted in said housing and alternatelymovable into a filling position and an emptying position, respectively apiston reciprocating in said cylinder,

said piston being divided by at least one portion of larger diameter anda portion of smaller diameter into a stepped-up piston,

the inner surface of said cylinder being stepped down complementary tosaid stepped-up piston,

said stepped-up piston defining in said cylinder an annular chamber atthe end face of the portion of said piston having a larger diameter anda cylindrical chamber at the end of the portion of said cylinder havinga smaller diameter,

said filling housing having a filling opening within the range of saidchambers, and

said cylinder having a lateral opening within the range of said annularchamber and said cylindrical chamber, respectively, thereby providingalternately communication with said housing for filling said chambersand with said opening in said housing, respectively, for emptying saidcylinder, depending upon the position of said cylinder.

2. The filling device as set forth in claim 1, wherein said chambers ofsaid cylinder have equal volumes.

3. The filling device, as set forth in claim 1, wherein said chambers ofsaid cylinder are of different volumes.

1. A filling device for filling in doses of soft-plastic material with apiston, comprising a filling housing, a dosaging cylinder rotatablymounted in said housing and alternately movable into a filling positionand an emptying position, respectively a piston reciprocating in saidcylinder, said piston being divided by at least one portion of largerdiameter and a portion of smaller diameter into a stepped-up piston, theinner surface of said cylinder being stepped down complementary to saidstepped-up piston, said stepped-up piston defining in said cylinder anannular chamber at the end face of the portion of said piston having alarger diameter and a cylindrical chamber at the end of the portion ofsaid cylinder having a smaller diameter, said filling housing having afilling opening within the range of said chambers, and said cylinderhaving a lateral opening within the range of said annular chamber andsaid cylindrical chamber, respectively, thereby providing alternatelycommunication with said housing for filling said chambers and with saidopening in said housing, respectively, for emptying said cylinder,depending upon the position of said cylinder.
 2. The filling device asset forth in claim 1, wherein said chambers of said cylinder have equalvolumes.
 3. The filling device, as set forth in claim 1, wherein saidchambers of said cylinder are of different volumes.